Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7334665 | Interlock wiring communication system for elevators | Rory Smith, San Soemardjan, Randolph W. Huff | 2008-02-26 |
| 7246689 | Self-powered elevator button | Randolph W. Huff | 2007-07-24 |
| 6923065 | Apparatus for testing aramid fiber elevator cables | Rory Smith, Robert Sweet, Michael Palazzola, Randall Parrish | 2005-08-02 |
| 6854566 | Contactless push button switch comprising a hall effect transducer and microprocessor | Robert Sweet, Michael Palazzola | 2005-02-15 |
| 6612404 | Contactless hall effect push button switch | Robert Sweet, Michael Palazzola | 2003-09-02 |